Positioning (GPS)About GPSThe Global Positioning System (GPS) is a worldwideradio navigation system that includes 24 satellites andtheir ground stations that monitor the operation ofthe satellites. Your device has an internal GPS receiver.A GPS terminal receives low-power radio signals fromthe satellites and measures the travel time of thesignals. From the travel time, the GPS receiver cancalculate its location to the accuracy of meters.The coordinates in the GPS are expressed in degreesand decimal degrees format using the internationalWGS-84 coordinate system.The Global Positioning System (GPS) is operated by thegovernment of the United States, which is solelyresponsible for its accuracy and maintenance. Theaccuracy of location data can be affected byadjustments to GPS satellites made by the UnitedStates government and is subject to change with theUnited States Department of Defense civil GPS policyand the Federal Radionavigation Plan. Accuracy canalso be affected by poor satellite geometry. Availabilityand quality of GPS signals may be affected by yourlocation, buildings, natural obstacles, and weatherconditions. The GPS receiver should only be usedoutdoors to allow reception of GPS signals.Any GPS should not be used for precise locationmeasurement, and you should never rely solely onlocation data from the GPS receiver and cellular radionetworks for positioning or navigation.Your device also supports Assisted GPS (A-GPS).Assisted GPS (A-GPS) is used to retrieve assistance dataover a packet data connection, which assists incalculating the coordinates of your current locationwhen your device is receiving signals from satellites.A-GPS is a network service.Your device is preconfigured to use the Nokia A-GPSservice, if no service provider specific A-GPS settingsare available. The assistance data is retrieved from theNokia A-GPS service server only when needed.You must have a packet data internet access pointdefined in the device to retrieve assistance data fromthe Nokia A-GPS service. To define an access point for© 2008 Nokia. All rights reserved. 99
